Strip-shaped catalyst filtering device and method

Abstract

The strip-shaped catalyst filtering device comprises a shell, a feeding port is formed in the top of the shell, a discharging port is formed in the bottom of the shell, and a uniform distribution layer, a filter screen layer, a supporting layer and a flow guide layer are sequentially arranged in the shell from top to bottom; the filter screen layer comprises a first limiting layer, a filter element layer and a second limiting layer, and the filter element layer is located between the first limiting layer and the second limiting layer and fixedly connected with the first limiting layer and the second limiting layer; the filter element layer is formed by sintering a plurality of layers of metal ball sintering nets, the centers of metal balls of every two adjacent layers of metal ball sintering nets are arranged in a staggered mode, the metal ball sintering nets are formed by sintering metal balls in a point contact mode, and the centers of the metal balls are arranged in a center alignment mode; the filtering device has a good filtering effect on a catalyst with a large length-diameter ratio, a good catalyst filtering effect can be obtained while large oil slurry flow is guaranteed, and meanwhile the service time of the filtering device can be effectively prolonged.

Description

Technical Field

[0001] The present invention relates to the field of catalyst filtration, and in particular to a strip-shaped catalyst filtration device and method. Background Art

[0002] Catalytic cracking slurry is a by-product of crude oil refining. It is rich in aromatics, colloids, and asphaltenes, and has the characteristics of high viscosity and density. It also contains a large amount of catalyst powder particles. The presence of catalyst powder will cause trouble for the operation of the extraction tower and solvent recovery, seriously limiting the comprehensive utilization of catalytic cracking slurry. Therefore, effective measures must be taken to efficiently and quickly remove the solid catalyst powder in the slurry.

[0003] Currently, the main methods for removing solid catalyst powder from oil slurry at home and abroad include sedimentation separation, filtration separation, electrostatic separation, centrifugal separation, and auxiliary agent sedimentation separation. Filtration separation is a separation technology that purifies the oil slurry by filtering the solid catalyst powder from the oil slurry through a filter medium. Filtration separation has the advantages of simple equipment and operation, and stable separation efficiency.

[0004] Strip catalysts are strip-shaped catalysts characterized by a larger aspect ratio. Conventionally, increasing the slurry filtration flow rate can be achieved by increasing the filter pore diameter. However, this increase in pore size also results in a decrease in catalyst filtration efficiency. This approach has little impact when filtering ordinary powdered and spherical catalysts. However, when filtering strip catalysts with a larger aspect ratio, a dilemma arises: maximizing both filtration flow rate and catalyst filtration efficiency cannot be achieved simultaneously.

[0005] Chinese patent document CN202120613645.8 discloses a device for intercepting and filtering catalysts in chemical processes, including a supporting base plate, a rotating structure and a filtering structure. The bottom of the supporting base plate is fixedly connected to a supporting column. The rotating structure includes a first rotating plate, which is rotatably connected to the top of the supporting base plate. The top of the first rotating plate is fixedly connected to a connecting column, and the top of the connecting column is fixedly connected to a filter housing. The device is not effective when filtering strip catalysts.

[0006] Chinese patent document CN202010139648.2 discloses a catalytic cracking oil slurry filtering device and a catalytic cracking oil slurry filtering method. The catalytic cracking oil slurry filtering device includes an oil slurry feed tank, a first filtering device, and a second filtering device. The feed inlet of the first filtering device is connected to the discharge end of the oil slurry feed tank through a feeding device. The first concentrated liquid outlet of the first filtering device is connected in parallel with a first concentrated liquid pipe and a second concentrated liquid pipe. The first concentrated liquid pipe is connected to the first feed end of the oil slurry feed tank, and the first concentrated liquid pipe is provided with a first control valve. The first filtering device includes a first purified oil outlet; the feed inlet of the second filtering device is connected to the second concentrated liquid pipe, and the second concentrated liquid pipe is provided with a second control valve. The second purified oil outlet of the second filtering device is connected to the second feed end of the oil slurry feed tank. However, the device is prone to cake formation on the filter surface, which clogs the filter holes, and the filtering and purification effect decreases after use for a period of time. Summary of the Invention

[0007] In order to address the deficiencies in the prior art, the purpose of the present invention is to provide a strip catalyst filtration device and method, which can be used in upflow or downflow reactors, has a good interception effect on catalysts with a large aspect ratio, can ensure a larger oil slurry flow rate while obtaining better catalyst filtration and support effects, and can also effectively extend the service life of the filtration device.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A strip-shaped catalyst filter device comprises a housing, wherein the top of the housing is provided with a feed port, the bottom of the housing is provided with a discharge port, and the inside of the housing is provided with a uniform distribution layer, a filter layer, a support layer, and a guide layer in order from top to bottom;

[0010] The filter layer includes a first limiting layer, a filter core layer, and a second limiting layer. The filter core layer is located between the first limiting layer and the second limiting layer and is fixedly connected to the first limiting layer and the second limiting layer. The filter core layer is sintered by several layers of metal ball sintered mesh.

[0011] Preferably, the number of layers of the metal ball sintered mesh is 3 to 8.

[0012] Preferably, the metal ball centers of two adjacent layers of the metal ball sintered mesh are staggered.

[0013] Preferably, the metal ball sintered mesh is formed by point-contact sintering of metal balls, and the centers of the metal balls are arranged in a centrally aligned manner.

[0014] Preferably, the metal ball is a hollow metal ball and / or a solid metal ball.

[0015] Preferably, the uniform distribution layer, the first limiting layer and the second limiting layer are metal mesh layers; the mesh aperture of the uniform distribution layer is larger than the mesh aperture of the first limiting layer and the second limiting layer.

[0016] Preferably, the supporting layer is a grid plate.

[0017] Preferably, the guide layer includes a plurality of guide holes.

[0018] Preferably, along the fluid flow direction, the pores of the guide holes first decrease and then increase.

[0019] Preferably, a plurality of backwash ports are provided on the side wall of the shell, and the backwash ports are located below the guide layer.

[0020] Preferably, the backwash ports are symmetrically distributed along the axis of the housing.

[0021] The present invention also claims protection for a method for filtering strip catalysts using the device, wherein the oil slurry is introduced into the outer shell from the feed port, and the oil slurry enters the filter layer after being uniformly distributed by the uniformly distributed layer. The irregular filter channels formed by the filter core layer intercept and filter the oil slurry, and the filtered oil slurry is led out of the device from the discharge port; during backwashing, the flushing liquid is introduced from the backwash port, and after being accelerated by the venturi structure of the guide hole, the filter cake remaining on the filter screen is flushed, and the filter screen is regenerated.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) The strip catalyst filter device provided by the present invention has a good filtering effect on ordinary powdered catalysts and spherical catalysts by providing a filter element layer, and the interception and filtration effect on strip catalysts is particularly outstanding; by providing a guide layer, the replacement of the filter element can be reduced and the operation cycle of the filtration system can be improved.

[0024] 2) The present invention provides a strip-shaped catalyst filter device, in which metal balls are sintered to obtain a metal ball sintered mesh, and then multiple layers of the metal ball sintered mesh are sintered into one to obtain a filter element layer. The metal ball centers of two adjacent layers of the metal ball sintered mesh are staggered, thereby obtaining a filter element layer with an irregular pore structure. When the catalytic oil slurry passes through the filter element layer, the pore space repeatedly decreases and increases. Due to the Venturi effect, the fluid velocity repeatedly increases and decreases, which is more conducive to the precipitation and filtration of the catalyst. The irregular and tortuous pore structure has a particularly good interception effect on catalysts with a large aspect ratio, and can achieve a better catalyst filtration effect while ensuring a larger oil slurry flow rate.

[0025] 3) The guide layer provided by the present invention includes a plurality of guide holes. The pores of the guide holes first decrease and then increase along the direction of fluid flow. This can improve the passage rate of the oil slurry when filtering the oil slurry. During backwashing, it can also increase the flushing flow rate of the flushing liquid, improve the flushing effect, extend the service life of the filter element, and ensure the long-term stable operation of the filter device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only show schematic diagrams of certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic structural diagram of a strip catalyst filter device provided by the present invention;

[0028] Figure 2 Schematic diagram of the structure of the filter layer 5;

[0029] Figure 3 Schematic diagram of the structure of the filter element layer 502;

[0030] Figure 4 This is a top view of the filter element layer 502 of Example 1.

[0031] In the figure, 1, outer shell; 2, feed port; 3, discharge port; 4, uniform distribution layer; 5, filter layer; 501, first limiting layer; 502, filter element layer; 5021, metal ball sintered mesh; 503, second limiting layer; 6, support layer; 7, guide layer; 701, guide hole; 8, backwash port. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. Of course, the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0033] Terms like "first" and "second" are used solely to distinguish and should not be construed as indicating or implying relative importance. Furthermore, terms like "horizontal" and "vertical" do not necessarily require components to be absolutely horizontal or vertical; rather, they may be slightly tilted. For example, "horizontal" simply refers to a direction that is more horizontal than "vertical," not necessarily a perfectly horizontal structure; rather, it may be slightly tilted.

[0034] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0035] A strip-shaped catalyst filter device comprises a housing 1, wherein the top of the housing 1 is provided with a feed port 2, the bottom of the housing 1 is provided with a discharge port 3, and the inside of the housing 1 is provided with a uniform distribution layer 4, a filter layer 5, a support layer 6, and a guide layer 7 from top to bottom.

[0036] The filter layer 5 includes a first limiting layer 501, a filter core layer 502, and a second limiting layer 503. The filter core layer 502 is located between the first limiting layer 501 and the second limiting layer 503, and is fixedly connected to the first limiting layer 501 and the second limiting layer 503; the filter core layer 502 is sintered by several layers of metal ball sintered mesh 5021.

[0037] Specifically, the number of layers of the metal ball sintered mesh 5021 can be set according to specific circumstances, and is preferably 3 to 8 layers.

[0038] Specifically, the metal ball centers of two adjacent layers of the metal ball sintered mesh 5021 are staggered.

[0039] Specifically, the metal ball sintered mesh 5021 is formed by point-contact sintering of metal balls, and the centers of the metal balls are arranged in a centrally aligned manner.

[0040] Specifically, the metal ball is a hollow metal ball and / or a solid metal ball.

[0041] Specifically, the uniform distribution layer 4 , the first limiting layer 501 , and the second limiting layer 503 are metal mesh layers; the mesh aperture of the uniform distribution layer 4 is larger than the mesh aperture of the first limiting layer 501 and the second limiting layer 503 .

[0042] Specifically, the support layer 6 is a grid plate.

[0043] Specifically, the guide layer 7 includes a plurality of guide holes 701 . Along the fluid flow direction, the pores of the guide holes 701 first decrease and then increase.

[0044] Preferably, a plurality of backwash ports 8 are provided on the side wall of the shell 1 . The backwash ports 8 are located below the guide layer 7 , and the backwash ports 8 are symmetrically distributed along the axis of the shell 1 .

[0045] The present invention also provides a method for filtering strip catalysts using the device, wherein the oil slurry is introduced into the outer shell 1 from the feed port 2, and the oil slurry enters the filter layer 5 after being uniformly distributed by the uniformly distributed layer 4. The irregular filter channel formed by the filter core layer 502 intercepts and filters the oil slurry, and the head is removed to take out the catalyst. The filtered oil slurry is led out of the device from the discharge port 3; during backwashing, the flushing liquid is introduced from the backwash port 8, and after being accelerated by the Venturi structure of the guide hole 701, the filter cake remaining on the filter screen is flushed, and the filter screen is regenerated.

[0046] The present invention will be further described below with reference to specific examples.

[0047] Example 1

[0048] like Figure 1 As shown, a strip catalyst filter device comprises a housing 1, wherein the top of the housing 1 is provided with a feed port 2, the bottom of the housing 1 is provided with a discharge port 3, and the inside of the housing 1 is provided with a uniform distribution layer 4, a filter layer 5, a support layer 6, and a guide layer 7 from top to bottom;

[0049] like Figure 2 As shown, the filter layer 5 includes a first limiting layer 501, a filter core layer 502, and a second limiting layer 503. The filter core layer 502 is located between the first limiting layer 501 and the second limiting layer 503 and is fixedly connected to the first limiting layer 501 and the second limiting layer 503; Figure 3 As shown, the filter element layer 502 is formed by sintering three layers of metal ball sintered mesh 5021.

[0050] like Figure 4 As shown, the metal ball centers of the two adjacent layers of the metal ball sintered mesh 5021 are staggered.

[0051] The metal ball sintered mesh 5021 is formed by point-contact sintering of metal balls. The centers of the metal balls are arranged in a centrally aligned manner. The metal balls are hollow metal balls and / or solid metal balls.

[0052] The uniform distribution layer 4 , the first limiting layer 501 , and the second limiting layer 503 are metal mesh layers; the mesh aperture of the uniform distribution layer 4 is larger than the mesh apertures of the first limiting layer 501 and the second limiting layer 503 .

[0053] The supporting layer 6 is a grid plate.

[0054] The guide layer 7 includes a plurality of guide holes 701 . Along the flow direction of the fluid, the pores of the guide holes 701 first decrease and then increase.

[0055] A plurality of backwash ports 8 are provided on the side wall of the shell 1 . The backwash ports 8 are located below the guide layer 7 and are symmetrically distributed along the axis of the shell 1 .

[0056] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A strip catalyst filter device, characterized in that: The invention comprises a shell (1), wherein the top of the shell (1) is provided with a feed port (2), the bottom is provided with a discharge port (3), and the inside of the shell (1) is provided with a uniform distribution layer (4), a filter layer (5), a support layer (6), and a guide layer (7) in order from top to bottom; The filter layer (5) comprises a first limiting layer (501), a filter core layer (502), and a second limiting layer (503); the filter core layer (502) is located between the first limiting layer (501) and the second limiting layer (503), and is fixedly connected to the first limiting layer (501) and the second limiting layer (503); the filter core layer (502) is sintered by a plurality of layers of metal ball sintered mesh (5021); The metal ball centers of two adjacent layers of the metal ball sintered mesh (5021) are arranged in a staggered manner.

2. The filtering device according to claim 1, characterized in that The number of layers of the metal ball sintered mesh (5021) is 3 to 8.

3. The filtering device according to claim 2, characterized in that The metal ball sintered mesh (5021) is formed by point-contact sintering of metal balls, and the centers of the metal balls are arranged in a centrally aligned manner.

4. The filtering device according to claim 3, characterized in that The metal ball is a hollow metal ball and / or a solid metal ball.

5. The filtering device according to claim 4, characterized in that The uniform distribution layer (4), the first limiting layer (501), and the second limiting layer (503) are metal mesh layers; the mesh aperture of the uniform distribution layer (4) is larger than the mesh apertures of the first limiting layer (501) and the second limiting layer (503).

6. The filtering device according to claim 5, characterized in that The supporting layer (6) is a grid plate.

7. The filtering device according to claim 6, characterized in that The guide layer (7) includes a plurality of guide holes (701).

8. The filtering device according to claim 7, characterized in that Along the fluid flow direction, the pore size of the guide hole (701) first decreases and then increases.

9. The filtering device according to claim 8, characterized in that A plurality of backwash ports (8) are provided on the side wall of the shell (1), and the backwash ports (8) are located below the guide layer (7).

10. The filtering device according to claim 9, characterized in that The backwash ports (8) are symmetrically distributed along the axis of the housing (1).

11. A method for filtering strip catalysts using the filtering device according to any one of claims 1 to 10, characterized in that: The oil slurry is introduced into the housing (1) from the feed port (2), and after being uniformly distributed by the uniform distribution layer (4), the oil slurry enters the filter layer (5). The irregular filter channels formed by the filter core layer (502) intercept and filter the oil slurry, and the filtered oil slurry is led out of the device from the discharge port (3); during backwashing, the flushing liquid is introduced from the backwashing port (8), and after being accelerated by the Venturi structure of the guide hole (701), the filter cake remaining on the filter screen is flushed, and the filter screen is regenerated.

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